138results about How to "No stuck" patented technology

The invention discloses a vertical type bearing pressing machine which comprises a base; a rack is arranged on the base; an operation panel is arranged on the rack; a pushing rod drive device is arranged on the top of the rack; the pushing rod drive device comprises a servo motor and a spiral pair; in use, the servo motor drives a lead screw of the spiral pair to rotate and move; a pushing rod is arranged on a nut support of the spiral pair; a guide sleeve is arranged on the outer part of the pushing rod; a central deviation correcting device is arranged on the pushing rod drive device; a quick-to-change pressure head is arranged on the central deviation correcting device; a clamp is arranged on the bottom of the rack; the central deviation correcting device comprises an upper connecting part and a lower connecting part; a thrust ball bearing is arranged between the two connecting parts; a rubber spring is arranged in an inner cavity of the lower connecting part; a bearing clamping mechanism is arranged on the quick-to-change pressure head; the central deviation correcting device is fixed onto a pressure sensor at the lower end of the pushing rod drive device; and the quick-to-change pressure head is connected onto the central deviation correcting device. The vertical type bearing pressing machine is simple in structure, is convenient to operate, is high in assembly precision, is high in efficiency and is high in practicability.

The invention discloses a novel folding bed guard bar which comprises folding vertical rods arranged on the left side and the right side, wherein the upper and lower ends of the left vertical rod and the right vertical rod are respectively connected with an upper transverse rod and a lower transverse rod; the two vertical rods are connected with the upper transverse rod and the lower transverse rod to form a guard bar framework; supporting legs which are connected with a bed body and are used for preventing the framework from turning over are arranged at the bottom of the framework; two ends of the lower transverse rod extends into the vertical rods; locking devices for locking the supporting legs and the lower transverse rod so as to lock the framework are arranged between the supporting legs and the end part of the lower transverse rod; driving devices for folding the supporting legs and driving the locking devices to realize unlocking are arranged between the supporting legs and the vertical rods; a folding device for folding the bed guard bar is arranged on the framework. The novel folding bed guard bar is simple in structure and is very convenient to assemble and disassemble.

The invention relates to a PC-class automatic changeover switch device with an energy storage mechanism. The device comprises a base, a contact system which is arranged on the base, the energy storage mechanism which is in transmission connection with the contact system and a drive motor which is in transmission connection with the energy storage mechanism, wherein the drive motor is fixed on the base through a motor support; the energy storage mechanism comprises an energy storage support unit, an energy storage gear, an energy storage handle, an energy storage spring assembly and an energy storage cam, wherein the energy storage support unit is fixedly connected to the motor support; the energy storage gear is arranged in the energy storage support unit and is in transmission connection with the drive motor; the energy storage handle which is arranged above the energy storage gear and the bottom of the energy storage handle which is engaged with the energy storage gear; the energy storage spring assembly cooperates with the energy storage gear; and the energy storage cam is coaxial to the energy storage gear, is arranged at the outer side of the energy storage support unit and is in transmission connection with the contact system. Compared with the prior art, the device has simple and compact overall structure and convenient processing and manufacturing, and the energy storage mechanism is provided, so that when the automatic changeover switch rotates, the phenomenon of clamping stagnation or failed linkage cannot occur, and the device is safe and reliable.

The invention provides a three-position four-way water pressure magnetic exchange valve used in a deep sea and relates to a component which controls a liquid flow direction in a hydraulic system. The three-position four-way water pressure magnetic exchange valve used in the deep sea is composed of two guide control valves, four sets of insertion components, two control cover plates and an insertion block. Each set of insertion component comprises a valve core, a valve sleeve, a spring and a sealing piece combination. Four sets of cone-valve-shaped two-way insertion components which are in the same structure are mutually communicated through ducts which are formed in the inner portion of a valve body by utilizing a method of plug-in mounting plus cover plates. The guide control valves control the opening or closing of each valve opening of each insertion component, and therefore a communication mode of four valve openings including a P valve opening, an A valve opening, a B valve opening and a T valve opening of the three-position four-way magnetic exchange valve is changed, and reversing function is achieved. The three-position four-way water pressure magnetic exchange valve used in the deep sea is suitable for a liquid flow direction control situation of middle and high pressure aqueous media (fresh sea water, seawater base and the like) and is particularly suitable for being used in a deep-sea mass-flow water hydraulic transmission system.

The invention relates to a pressurizing and locking hydraulic buffer system, belonging to the field of hydraulic buffer. The system comprises a hydraulic cylinder and an oil storage tank, wherein the hydraulic cylinder comprises a cylinder sleeve, a piston and a piston rod; the hydraulic cylinder is divided into a first chamber and a second chamber by the piston; a first oil extraction oil line and a first oil absorption oil line are communicated by virtue of the first chamber and the oil storage tank; the pressurizing and locking hydraulic buffer system also comprises at least one overflow valve, at least one electromagnetic valve and at least one hydraulic damp; and the overflow valve and the electromagnetic valve are connected in parallel in the first oil extraction oil line and a second oil extraction oil line. The supercharging and locking hydraulic buffer system provided by the invention has the advantages of skillful design, simple and compact structure, low failure rate and good buffer effect; through setting the constant hydraulic damp, the resistance force buffer effect is achieved in proportion to the cornering speed of a vehicle; and as the overflow valve is arranged, the vehicle is enabled to be provided with the functions of super angle locking and safe protection.

The invention provides a cooling device for the interference fit of a large-scale workpiece. The cooling device comprises a liquid nitrogen container and a cooling tank, wherein the liquid nitrogen in the liquid nitrogen container is transmitted to the cooling tank through a pipeline. The cooling device is characterized in that a liquid nitrogen vaporization device is arranged on the pipeline; a cooling medium in the cooling tank is low-temperature gas generated after the liquid nitrogen is vaporized; an installation table for placing a contained piece is arranged at the bottom of the cooling tank; and the liquid nitrogen level in the cooling tank is lower than the table surface of the installation table. The cooling device can be used for controllably cooling a special-shaped contained piece which has large size, complicated structure and asymmetrical shape, so that the dimension of the cooled contained piece is contracted to reach the assembly requirements; the property change of a bearing material caused by rapid temperature reduction can be effectively avoided, thereby avoiding the contained piece from being damaged; the cooling course is safe and reliable; and the maneuverability is strong. The cooling device has the advantages of low time consumption, high efficiency, good interference fit effect, low cost and safe operation and does not generate the conditions that the contained piece is locked and damaged.

The invention belongs to technical field of rotating component sealing, and discloses a bearing sealing device. A rotating shaft is installed in a bearing inner ring. A bearing pedestal is installed on a bearing outer ring. The bearing sealing device is characterized by comprising an annular groove formed in the outer end face of the bearing pedestal, wherein the annular groove and the rotating shaft are coaxial, the inner annular face of the annular groove is arranged to be a conical face, the diameter of the opening of the conical face is smaller than the diameter of the bottom of the conical face, a disc-spring-shaped sealing ring matched with the inner annular face is arranged in the annular groove, a check ring is installed on the rotating shaft, one end of the check ring is attached to the outer end face of the bearing inner ring, the other end of the check ring extends out of the outer end face of the bearing pedestal, and the disc-spring-shaped sealing ring and the check ring are fixed together. The bearing sealing device is simple in structure, good in sealing effect, particularly applicable to oil sealing of a self-aligning roller bearing and long in service life.

The invention provides a ball-throwing type controllable wall scraper and a method for cleaning the inner wall of a sleeve. The ball-throwing type controllable wall scraper comprises a control system, a cutter system, at least one first steel ball and at least one second steel ball, wherein the first steel balls and the second steel balls control the control system to work. The first steel balls are thrown into the control system, so that the first steel balls push a second piston to move downwards, when the second piston moves downwards and enables all cutter feeding blocks to move downwards to push cutters on all rings to pop out of cutter through holes, buckle structures between a first piston and the second piston are connected, and then wall scraping operation can be conducted; the second steel balls are then thrown into the control system, the second steel balls drive the buckle structures to separate from each other, the second piston moves upwards under the action of all reset springs, the cutter feeding blocks also move upwards, so that all the cutters retract to the cutter through holes, and then the wall scraper is restored to an initial state. According to the ball-throwing type controllable wall scraper, at least two steel balls different in size are thrown into a tool, so that the cutters pop out or retract, obstacles on the inner wall of the sleeve are smoothly removed, downhole potential safety hazards are effectively removed, the cutters will not get stuck, and the service life of the cutters is long.

The invention relates to a brake system having at least one piston-cylinder unit (4) for generating a pressure in at least one working chamber, wherein the working chamber is connected via at least one hydraulic line to at least one wheel brake, and wherein the brake system furthermore has at least one drive device (1) and one actuating device (10), in particular in the form of a brake pedal, and, in normal operation, the drive device (1, 1a) acts via a first force-transmitting means (2) on the at least one first piston (3) of the piston-cylinder unit (4) for the build-up and dissipation of pressure, and in the event of a fault, the actuating device (10) acts mechanically via a second force-transmitting means (5, 16) on the piston (3), wherein the adjustment of the second force-transmitting means (5, 16) by means of the actuating device (10); separates the connection between the first force-transmitting means (2) and the piston (3).

The invention relates to an adjusting device, in particular to a wireless remote control electric six-shaft adjusting platform applied to a DLP large-screen splicing system. The wireless remote control electric six-shaft adjusting platform comprises a supporting plate, a first adjusting plate, a fixing plate, a second adjusting plate and a bottom plate which are sequentially connected from top to bottom in the vertical direction, wherein the supporting plate is provided with an L-type support, the first adjusting plate is provided with two shafts in the horizontal transverse direction, a vertical support is arranged on the upper surface of the fixing plate, three vertical threaded rods are arranged on the lower surface of the fixing plate, the second adjusting plate is provided with four shafts in the horizontal transverse direction, and a horizontal longitudinal threaded rod is fixed to the bottom plate. One ends of the six shafts of the first adjusting plate and the second adjusting plate are connected with an output shaft of a wireless remote control motor. According to the adjusting device, a remote control unit is used for controlling the motor to adjust the six shafts to adjust the platform, adjusting is easy and convenient, and time and labor are saved; after adjusting is finished, by means of a locking device, displacement situations such as deflection, loosening and sinking are avoided permanently; the adjusting device is lighter, efficient and high in adjusting precision, and saves labor, and a noise-free adjusting mode is adopted; the adjusting efficiency is high, and the production schedule is shortened.

The present invention provides a coin processing device, capable of distinguishing true and false coins throwed to an throw-in port, sorting received coins and returned coins, receiving the received coins from a receiving port and holding them in a retaining device. The retaining device is composed of a carrying member arranged on the lower, and a pair of supporting members arranged on upper sidepart of the carrying member and capable of moving to a holding position and a non-holding position selectively. The held coins are conveyed to the receiving port or the returning port selectively by making the pair of supporting members to move to the holding position or non-holding position selectively. The invention is characterized in that the carrying member is mounted on a swinging member which swings freely by using an upper fulcra as a center, the pair of the supporting members move to the holding position or the non-holding position respectively, and the carrying member is driven to move in an identical direction when the supporting members move to the non-holding position.

The invention relates to a remotely controlled retracting and stretching device for an arm of a multi-rotor unmanned aerial vehicle. The remotely controlled retracting and stretching device for the arm of the multi-rotor unmanned aerial vehicle comprises folding mechanisms, a long cross-shaped plate, a short cross-shaped plate and the arm, wherein the folding mechanisms are mounted at four cornersof an unmanned aerial vehicle body; the long cross-shaped plate and the short cross-shaped plate are mounted in the middle of the unmanned aerial vehicle; the arm is connected to one ends of the folding mechanisms; the other ends of the folding mechanisms are movably connected with the short cross-shaped plate by short connecting rods; the arm is movably connected with the long cross-shaped platethrough long connecting rods; the long cross-shaped plate and the short cross-shaped plate are coaxial and are vertically distributed in a staggered manner; the long cross-shaped plate and the shortcross-shaped plate are separately connected with a steering engine; the steering engine is connected with a controller; and the steering engine is remotely controlled to drive the long cross-shaped plate and the short cross-shaped plate to rotate so as to unfold and fold the arm. Remotely controlled electric signals replace the traditional manual operation, so that a control system can be integrated onto an existing unmanned aerial vehicle remote controller; one-key unfolding and one-key folding of the remote controller are realized; speediness in operation and good maneuverability are achieved; the arm can be unfolded in time; time difference exists in rotation; and the circumstance that the device is jammed in a movement process to burn out the steering engine is avoided.

The invention provides an oil seal press mounting device for an oil pump and belongs to the technical field of machinery. By means of the oil seal press mounting device for the oil pump, the problem that production efficiency and the product qualification rate of an existing oil seal press mounting machine are low is solved. The oil seal press mounting device for the oil pump comprises a working table, a tray, a locating table, a press mounting head, a transferring table, a transferring assembly and a first driving part for driving the press mounting head to move up and down. The working tableis further provided with a second driving part, a third driving part and a fourth driving part. The locating table can be driven to slide along the working table by the second driving part, a coatinghead is driven to move up and down by the third driving part, and the transferring table can be driven to move below the press mounting head by the fourth driving part. The coating head and the pressmounting head are arranged in a spaced manner in the moving direction of the locating table. A first negative pressure cavity is formed in the press mounting head, and the first negative pressure cavity is connected with a negative pressure generator through a pipeline. According to the oil seal press mounting device for the oil pump, a working procedure of applying lubricating oil is added before an oil seal is assembled and press-mounted; and in addition, the press mounting head has functions of pressing the oil seal and assembling the oil seal, and efficiency of production and the qualification rate of products are improved greatly.

The invention relates to a device for simulating a force on an actuation element of a vehicle, in particular a pedal force simulator, comprising a housing (10), a piston (20) which can be moved axially in the housing (10), said piston (20) being connected to the actuation element via a piston rod (30), and a spring element (40) which is arranged at least partly within the housing (10), in particular completely within the housing. According to the invention, the piston (20) has a changing cross-section and engages into the spring element (40) upon being actuated by the actuation element. The spring element (40) is equipped with rolling bodies (70, 80) which are operatively connected to the piston (20), and the spring element (40) consists at least of a first and a second spring part (50, 60) which are connected together.

The invention provides a wind and water combined slag cooler for a fluidized bed. The wind and water combined slag cooler is mainly used as a bottom slag cooling and discharging device for a boiler ofa circulating fluidized bed. Coking and slag blocking phenomena of the slag cooler for the fluidized bed are eliminated, the operation of the wind and water combined slag cooler is not limited by theparticle size of bottom slag, and slag inlet and outlet control is simple and convenient. First, a material discharge opening or an accident slag discharge opening is not formed in a slag inlet high-temperature area of the slag cooler in any forms, a whole wind-distribution plate is complete and uniform from a slag inlet to a slag outlet, and only one slag outlet is formed to prevent the coking phenomenon due to a bad fluidizing effect of the high-temperature area; second, wind caps are arranged in a crossed manner in the wind-distribution plate, small holes in the wind caps are inclined downwards by a certain angle, and the diameters of the small holes of the wind caps are 6-8 mm; third, the interior of the slag cooler is a complete cavity, and is not divided by a partition wall; fourth,wind control is adopted in the aspect of slag inlet control, and a slag inlet pipe section connected with the slag cooler forms an inclined angle of 14-25 degrees with the horizontal plane; and fifth, a water-cooled wall is prevented from being worn by a wear-resistant sheet, and spraying is performed on scenes to resist wear.

The invention discloses a fixation system capable of improving the paper separation accuracy. The fixation system is characterized in that an induction heating pipe is arranged in a housing, sleeved with a heating roller and connected with a thermistor; a pressure roller and a thermostat are arranged outside the heating roller; a heating roller separation claw is arranged on a discharging plate I; a pressure roller separation claw is arranged on a discharging plate II; pin shafts and springs are arranged on the heating roller separation claw and the pressure roller separation claw; one end of each spring is fixed with the heating roller separation claw or the pressure roller separation claw; a cleaning roller is arranged in the housing; a cam is arranged above the cleaning roller and is in contact with the cleaning roller; a stir rod is arranged in the cam and penetrates through the cam to be in contact with the pressure roller separation claw; an outlet inductor is fixed to the discharging plate II. According to the fixation system, by improving the structure, a separation device can be kept in a fixed position and cannot shift, so that paper cannot be jammed, the complete paper is guaranteed, and the image fixation quality is improved.

The invention relates to a constant pressure damping control and buffering system, which belongs to the technical field of hydraulic buffering, and includes a first hydraulic cylinder and a second hydraulic cylinder, as well as a first one-way valve, a second one-way valve, a first one-way overflow valve, a second one-way overflow valve and a pressure regulating valve, wherein a second hydraulic cylinder rodless cavity, a first hydraulic cylinder rod chamber, a first one-way valve, the pressure regulating valve, the first one-way overflow valve, a second hydraulic cylinder rod chamber and a first hydraulic cylinder rodless cavity are sequentially connected in series to form a first oil circuit; and the first hydraulic cylinder rodless cavity, the second hydraulic cylinder rod chamber, the second one-way valve, the pressure regulating valve, the second one-way overflow valve, the first hydraulic cylinder rod chamber and the second hydraulic cylinder rodless cavity are sequentially connected in series through a pipeline to form a second oil circuit. The constant pressure damping control and buffering system has unique design, low manufacturing cost, convenience for maintenance, excellent buffering effect, and the functions of locking and safety protection in case that the turning angle of vehicle is too big.

The invention provides a transmission box with a gear clutch, particularly a transmission box for transferring power to a hitching gearbox of an agricultural implement, belonging to the components of agricultural machinery. The transmission box comprises a box body, an input shaft, an output shaft, a driving wheel and a driven wheel, wherein the input shaft and the output shaft are mounted on the box body, the driving wheel is arranged on the input shaft and the driven wheel is arranged on the output shaft. The transmission box is characterized in that a gear clutch is arranged on the output shaft and near to one end outside the transmission box. The transmission box is beneficial to the power distribution of the hitching gearbox of the agricultural implement, can be used in paddy field and upland field, is free from clamp, slide and component damage, runs stably and is less impacted when being meshed.

The invention provides a multifunction integrated keyboard and belongs to the field of an electronic input device. The multifunction integrated keyboard comprises a keyboard body and a display screenmovably connected with one side of the keyboard body. A switch is set on the keyboard body. A keyboard circuit board and a power supply circuit are set in the keyboard body. An input end of the powersupply circuit is connected with the switch. An output end of the power supply circuit is connected with the keyboard circuit board for power supply. The display screen comprises a display screen panel and a display screen circuit board set on the back of the display screen panel. According to the multifunction integrated keyboard, through setting of the display screen on the keyboard body, a screen of a mobile device can be expanded by the display screen, the keyboard can be connected with the mobile device by a user for office, and an office demand when the user goes out can be satisfied.

The invention relates to a single-closed loop sideslip-free driving solar cell panel cleaning system for a large-scale photovoltaic power station, and belongs to the technical field of solar power generation. A solar cell panel is included, and a walking rolling cleaner is arranged on the solar cell panel; and the system is characterized in that the two ends of the walking rolling cleaner are fixed to two segments, of the same walking direction, of one steel rope respectively, and the steel rope is driven by a driving motor. The cleaning system has the advantages that the cleaner is prevented from jamming, falling off and the like caused by up and down inclination in the working process, the reliability of the solar cell panel cleaning is greatly improved, the system can be used to clean the photovoltaic panel with certain gap and inclination, the battery capacitance is reduced by at least half, the cost is reduced, and the maintenance amount is reduced.

The invention relates to a V-method casting production line, and belongs to the field of casting moulding. The V-method casting production line comprises a modeling system, a vacuum system, a pouringsystem, a sand conditioning system, a sand cooling system and a sand recovery system; the sand conditioning system comprises parallel and opposite risers; the top ends of the risers are rotationally connected with a turnover device; the turnover device comprises a carrying platform and a driving motor; an automatic clamping device is arranged on the carrying platform; a sand receiving funnel is arranged right below the carrying platform; a sand conveying belt is arranged below the sand receiving funnel; a casting conveying belt is arranged at one side of the carrying platform in the rotation direction; a gap enabling a casting not to fall off is reserved between the casting conveying belt and a circle formed by rotation of the carrying platform; the sand cooling system comprises a sand vibration screen; a material hoist is arranged below the discharge end of the sand vibration screen; a falling sand cooling barrel is arranged at the conveying tail end of the material hoist. The V-method casting production line has the advantage of carrying out sand cleaning on the finished casting without carrying out artificial manual cleaning on the finished casting.

The invention relates to the technical field of a valve device and especially relates to a rotary ceramic feed valve. the rotary ceramic feed valve comprises an upper valve body and a lower valve body which are fixedly sealed and connected, a valve rod is arranged in the lower valve body, the valve rod adjacent to one side of the upper valve body is provided with a valve plate in which a spring connected with the valve plate is embedded; the connection position of the upper valve body and the valve plate is provided with a sealing ring; the outer wall of the upper valve body is provided with a spindle which is connected with the valve rod, the upper half part of the spindle is connected with a swinging arm which is connected with a pneumatic device. The rotary ceramic feed valve is rationally designed, prolonged in service life, and resists wear and heat, thus the feed valve is applied to a thermal power plant, and various dust and granule conveying systems in metallurgy, medicine and chemical engineering, it is low in dust deposition and simply maintained, and has excellent sealing performance and long service life, without jamming.

The invention discloses an electrical connection interface, and the interface comprises an active interface part which comprises a flange connection body and is provided with an accommodation space, aconnection flange located on a first surface, and a connection bottom surface located on a second surface; and also comprises a rotor adapter, an electric connector male end, a rotor, a nut, a floating device, a hollow screw, a shell and a ultrasonic motor arranged in the accommodating space; the ultrasonic motor is arranged on the first surface, the rotor adapter sleeves the first end of the male end of the electric connector and is attached to the ultrasonic motor, and the rotor is fixed on the rotor adapter; the nut sleeves the male end of the electric connector and is clamped in the rotoradapter, and the nut is radially supported and axially limited in the shell through an angular contact ball bearing pair; the floating device is placed in the hollow screw and is fixedly connected with the inner wall of the hollow screw, and the hollow screw sleeves the second end of the electric connector male end through an internal thread of the floating device; and the ultrasonic motor drivesthe rotor adapter and the rotor to rotate and drives the nut to rotate.

The invention provides an exhaust structure of a vacuum pump, and belongs to the technical field of machinery. The problem that a conventional exhaust structure is high in noise and liable to damage is solved. The exhaust structure of the vacuum pump comprises a valve seat and a valve core, wherein one end of the valve seat is open; the open end is connected to an exhaust opening of a pump body and communicates with the exhaust opening; gas outlets are formed in the side wall of the valve seat; the outer side wall of the valve core and the inner wall of the valve seat are sealed; the outer side wall of the valve core can slide along the inner wall of the valve seat; an elastic part I and an elastic part II are further arranged in the valve seat; the elastic part I abuts against one end of the valve core; the sealing part of the outer side wall of the valve core and the inner wall of the valve seat is positioned between the exhaust opening and the gas outlets under the action of the elastic part I; and the two ends of the elastic part II separately abut against the other end of the valve core and the valve seat. According to the exhaust structure of the vacuum pump, a high-pressure gas is directly exhausted from gas passing holes and the gas outlets, a reflux gas and the gas exhausted from the pump body are prevented from colliding with each other, secondary collision between the gas and the valve seat is avoided, and noise is reduced.

The invention relates to an inner pot component and a rice cooker. The inner pot component includes an inner pot, a connecting cylinder and a lifting unit; the inner pot is vertically divided into a first pot body and a second pot body, wherein the part of the inner pot where the opening is located is the first pot body; the first pot body is provided with a steaming grid limit positioning; the first pot body and the second pot body are communicated through the connecting cylinder; the length of the connecting cylinder in the longitudinal direction is retractable; the retractable end of the lifting unit is connected or butted with the second pot body; and the retractable end of the lifting unit can stretch out and draw back longitudinally for adjusting the longitudinal distance between thesecond pot body and the first pot body. In the process of rice water separation, the lifting unit only bears the water in the inner pot and the weight of the second pot body; therefore, the lifting process is more stable, and no clamping stagnation appears. The utensil for containing water and grain formed by the inner pot and the connecting cylinder is easy to be sealed, and only covering the pot cover directly on the opening of the inner pot is required; therefore, the sealing is better.

The invention provides a flashlight, and belongs to the field of lighting tools. The flashlight comprises a lamp barrel assembly, a lighting assembly connected with the front end of the lamp barrel assembly, a telescopic ring sleeving the periphery of the lamp barrel assembly and lighting assembly, and a lamp cap assembly connected with the front end of the telescopic ring, a first damping ring which is used for abutting against the inner wall of the telescopic ring is arranged on the periphery of the lighting assembly, a second damping ring which is used for abutting against the inner wall ofthe telescopic ring is arranged on the periphery of the lamp barrel assembly, a ventilation groove which is used for communicating the inner cavity of the telescopic ring with external air is arranged on the inner wall of the telescopic ring, and the opening direction of the ventilation groove faces to the inner part of the telescopic ring. According to the flashlight, when the focusing is carried out, the air pressure in the telescopic ring can be consistent with the air pressure of the external air, the telescopic ring does not have the phenomenon of locking or rebounding in the telescopicprocess, focusing can be carried out by using a single hand, the operation is simple, and a stepless telescopic focusing function can be achieved, the adjusting range is more flexible and the focusingeffect is better.

The invention relates to a connecting device between a friction ring (2) and a support part (4) of a brake disk, wherein the friction ring (2) is connected to the friction ring (2) by means of connecting elements (12), wherein a plurality of connecting elements (12) arranged in a distributed manner over the circumference of the support part (4) and connected to the support part (4) protrude into openings in a radially inner circumferential wall of the friction ring (2), wherein the holes (20) in the friction ring (2) and the connecting elements (12) are conical, and wherein the conical hole in the friction ring (2) is extended radially inwardly and the conical connecting elements (12) are tapered radially outwardly. In a method for designing or producing the connecting device, the holes (20) in the friction ring (2) and the connecting elements (12) are designed to be correspondingly conical.